I. Design Standard
 The hydraulic piston rod seal step ring MOD series conform GB/T 15242.1-94 and GB/T 15242.3-94 standards. Reference Parker's OD series, Merkel's OMS-MR series, Trelleborg's RS1 series,AS's XB series and Shamban's S55013 series.
II. Performance and Purpose
The single-acting rod sealing set profile OD consists of a PTFE rod sealing ring and an elastomer O-Ring as a preloading element. The asymmetrical cross-section of the slipper ring is designed for best drag oil performance during stroke in both directions. Optimal sealing performance will be obtained if the rod sealing set is used in tandem with a double-wiper. Profile OD is particularly suitable for sealing rods in control cylinders, servo-assisted equipment, machine tools and quick acting cylinders. The sealing set is also suitable for applications in the automotive (e.g. shock absorbers) and process industries. The material combination of the slipper ring (PTFE) and the O-Ring (elastomer) makes this product suitable for a wide range of applications, especially for aggressive media and/or high temperatures. Multiple compounds can alternatively be selected according to the individual application profile.
III.Features
   Service pressure:0-60MPa;
    Reciprocation speed:≤5m/s;
    Thermal Application:
                           Acrylonitrile-butadiene-rubber(NBR):-30~+120ºC,
                           Fluoro-rubber(FKM):-20~+200ºC;
    Working media:hydraulic oil, HFA/HFB, gas, water etc. (Polyfluoroprene is adopted in phosphoric acid ester hydraulic oil)
IV.Advantages
• Good sealing performance in extremely small assembly conditions.
• Excellent wear resistance.
• Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform motion even at low speeds.
• Good energy efficiency due to low friction.
• Insensitive to pressure peaks.
• High temperature resistance assured by suitable O-Ring compound selection.
• High extrusion resistance.
• Adaptable to nearly all media thanks to high chemical resistance of the sealing ring and large O-Ring compound selection.
• Dimensions according to ISO ­7425-2.
• Also available as double-acting version.
• Short axial assembly length.
• Installation in closed and undercut housings.
• Available in diameters from 4 to 3000 mm.
• Further dimensions of machined series with short lead times available.
V. Dimensions